I met the problem when using System.Windows.Forms.MonthCalendar in my app. When user changes and selects another month or year on MonthCalendar, this component was display incorrectly (some dates was missed or was bolded). I think it's problem of OnPaint() method of this component. It's really problem of Microsoft. I asked my friends and search it on Google, many people was still met it but I haven't found their solution yet....
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